Due to the limitations of the Japanese versions, your best bet would be to work off of an existing English version, otherwise, you're stuck with limited character and item names, which is why there is no "complete" translation of Green. People realize how hard it is. Your best bet, like the hack linked above, is to work off of Red or Blue and just import the tilesets from Green into it (and change the layout of the Cerulean Cave). I'm sure there are plenty of tools for Red and Blue.
Also, rewriting the script based on the English translation isn't really faithful to the Japanese text, so I'm not really sure what your goal is for it. It kind of defeats the purpose of a translation to just play the Red/Blue script with Green's graphics.